Umbrella frame



FIG. 1 is a perspective view of an umbrella frame showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view of a single umbrella rib of the umbrella frame, shown separately for ease of disclosure.

The broken lines depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for an umbrella frame, as shown and described. 